My FD uses AvCall for siren activation at the individual companies. Is there a way to determine the mixed tone frequency and use that for the Fire Tone-Out function of the BCT-15? I know the tones that are being mixed to make the two-tone sequence, but I'm not sure how to determine what the mixed tone frequency is. For example, company 1 uses AvCall BP (tone 1 mixture of 346.7 and 1083.9) and JM (tone 2 mixture of 716.1 and 977.2).

I suppose I could try entering one tone from each pair and see if that works. While that has the possibility to generate a false positive, I don't think anyone in the area uses any of the four individual tones for other purposes.

Never heard of AvCall tones, but based on your description, it sounds identical to Quik-Call 1 (2+2) tones, like the tones used in the TV show EMERGENCY! and your station's siren tone probably sounds like this.

The fire tone-out feature of the Uniden DMA scanners will not decode these codes, because the encoder essentially "plays" the two mixed tones at the same time. Simply choosing one tone or taking the average of the two tones will not produce a usable tone value.

I'd love to see the decoder your fire department uses to receive these tones!

__________________
Matt
"If the tallest building in your county is a grain silo, you DON'T need 800mhz!"

XT Fire Tone out decodes my area fine - so what? but then i have to leave it on standby and can't scan the rest of the other systems/groups?
can i scan the systems /groups and will the radio alert when theres a page while on another channel or group?how to do it,
otherwise i dont see the need for knowing the FD paging tones, pl/dpl works better to isolate just the department i want and ignors the rest,
or does the radio just show tones